Mark 4-TDSL

Diesel GSE Heater

Airflow Up to 4,850 cfm
BTU Per Hour  625,000
Temp. Rise  140-160 F

Caterpillar C2.2, 4 cylinder turbo diesel

Engine rpm settings  1,100 to 2,800 rpm
Horsepower  61
Fuel Capacity 50 US gallons, 190 liters
Physical Dimensions   

65”H X 48” W X 115”L

Shipping Weight 3,700 lbs

For applications requiring diesel or Jet-A, the Spencer Mark 4- TDSL Diesel Coldbuster will deliver hot air at 140-160 degrees F above ambient in sub-zero climates. Powered by a 4 cylinder Cat turbo diesel engine, the TDSL can produce up to 625,000 BTU’s at 4,850 cfm. Our new “VariFlo” control allows maximum heat at low air flow outputs.


The newer lean burn technology along with our exhaust heat exchangers and balanced engine loading have been combined to produce a diesel heater that will not smoke and contaminate the clean air produced by the heater. This machine runs hot and clean.


The Mark 4-TDSL uses the “turbo-dynamic” heat exchanger technology we developed for the Mark 4-900 gasoline model. That model serviced an A-380 at 75N latitude in –40F temperature.

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